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F3200 Installation & Programming Manual Document No: LT0122
Programming System Configuration
Page 7-14 5 July 2001 Issue 2.7
GENERAL (CONT’D)
3. When programming logic equations, the amount of programming memory left can be
viewed by using the "free space" option of the OUTPUT LOGIC menu.
7.4.2 LOGIC OPERATORS
The logic operators allowed are as follows:
OR (+) logical or
C = A + B C is active if A is active or B is active.
AND (.) logical and
C = A . B C is active if A is active and B is active.
XOR (@) exclusive or
C = A @ B C is active if A is active and B is not, or B is active and A is not (i.e. if A and B
are in opposite states).
NOT (^) Logical inverse
B = ^ A B is active if A is not active
B is not active if A is active.
These Operators each have a key in the right hand column of the 4 x 4 keypad.
Using "1" to represent a "true" condition or "on" (active) state and "0" to represent a "false"
condition or "off" (inactive) state, the following tables show the function of the logic operators
for the various combinations of inputs (operands) A and B.
A
0
0
1
1
B
0
1
0
1
A + B
0
1
1
1
A . B
0
0
0
1
A @ B
0
1
1
0
^ A
1
1
0
0
^ B
1
0
1
0
TRUTH TABLE
Priorities & Evaluation
Equations are evaluated from left to right with the following priority:
Brackets > NOT > AND > OR, XOR (within brackets the priority is the same).
Example:
R1 = (Z1A + Z2A) . ^ Z3F means relay 1 is active if:
Zone 1 is in alarm or Zone 2 is in alarm; and Zone 3 is not in fault
This is different to R1 = Z1A + Z2A . ^Z3F which means relay 1 is active if :
Zone 1 is in alarm, or if
Zone 2 is in alarm and Zone 3 is not in fault.
Brackets "(" and ")" are used to group parts of an equation together so that the default
operator priority can be overridden.
In an equation, the number of "(" must always equal the number of ")".
"(" and ")" are a second function of the "RECALL" and "PRINT" keys.